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Commit 787360f8 authored by Jakub Kicinski's avatar Jakub Kicinski Committed by Alexei Starovoitov
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samples: bpf: fix build after move to compiling full libbpf.a 



There are many ways users may compile samples, some of them got
broken by commit 5f938057 ("samples: bpf: compile and link
against full libbpf").  Improve path resolution and make libbpf
building a dependency of source files to force its build.

Samples should now again build with any of:
 cd samples/bpf; make
 make samples/bpf/
 make -C samples/bpf
 cd samples/bpf; make O=builddir
 make samples/bpf/ O=builddir
 make -C samples/bpf O=builddir
 export KBUILD_OUTPUT=builddir
 make samples/bpf/
 make -C samples/bpf

Fixes: 5f938057 ("samples: bpf: compile and link against full libbpf")
Reported-by: default avatarBjörn Töpel <bjorn.topel@gmail.com>
Signed-off-by: default avatarJakub Kicinski <jakub.kicinski@netronome.com>
Signed-off-by: default avatarAlexei Starovoitov <ast@kernel.org>
parent 8d930450

samples/bpf/Makefile

+12 −5
Original line number Diff line number Diff line 
# SPDX-License-Identifier: GPL-2.0



BPF_SAMPLES_PATH ?= $(abspath $(srctree)/$(src))

TOOLS_PATH := $(BPF_SAMPLES_PATH)/../../tools



# List of programs to build

hostprogs-y := test_lru_dist

hostprogs-y += sock_example
@@ -49,7 +53,8 @@ hostprogs-y += xdpsock 
hostprogs-y += xdp_fwd



# Libbpf dependencies

LIBBPF := ../../tools/lib/bpf/libbpf.a

LIBBPF = $(TOOLS_PATH)/lib/bpf/libbpf.a



CGROUP_HELPERS := ../../tools/testing/selftests/bpf/cgroup_helpers.o

TRACE_HELPERS := ../../tools/testing/selftests/bpf/trace_helpers.o
@@ -233,15 +238,16 @@ CLANG_ARCH_ARGS = -target $(ARCH) 
endif



# Trick to allow make to be run from this directory

all: $(LIBBPF)

	$(MAKE) -C ../../ $(CURDIR)/

all:

	$(MAKE) -C ../../ $(CURDIR)/ BPF_SAMPLES_PATH=$(CURDIR)



clean:

	$(MAKE) -C ../../ M=$(CURDIR) clean

	@rm -f *~



$(LIBBPF): FORCE

	$(MAKE) -C $(dir $@)

# Fix up variables inherited from Kbuild that tools/ build system won't like

	$(MAKE) -C $(dir $@) RM='rm -rf' LDFLAGS= srctree=$(BPF_SAMPLES_PATH)/../../ O=



$(obj)/syscall_nrs.s:	$(src)/syscall_nrs.c

	$(call if_changed_dep,cc_s_c)
@@ -272,7 +278,8 @@ verify_target_bpf: verify_cmds 
		exit 2; \

	else true; fi



$(src)/*.c: verify_target_bpf

$(BPF_SAMPLES_PATH)/*.c: verify_target_bpf $(LIBBPF)

$(src)/*.c: verify_target_bpf $(LIBBPF)



$(obj)/tracex5_kern.o: $(obj)/syscall_nrs.h